The author lived in western Africa as a Christian missionary and intends this study as a tool of conversion. The study is divided into three books. The first book describes the historical context in which Mohammed lived and the important accomplishments of his life. In Book II, Koelle argues that Muslim authors plagiarized the story of Christ when writing about Mohammed. The book details the parallel storylines and symbolism. Chapter II of Book II contains filtered descriptions of Mohammed's physical aspects and personal habits as described by Muslim writers (his dress, his physical qualities, his miracles, his habits as to sneezing and yawning, etc). Book III is a Christianity-based assessment of "the real nature of the position occupied by Mohammedanism ..."